Who was the Three Amigos' arch-enemy?

The "Three Amigos" was Martin Short's first major movie role. He was born on Mar. 26, 1950. He co-starred in the movie with Steve Martin and Chevy Chase.

Six years before the movie came out, Steve Martin talked about an earlier draft of the script during an interview with Playboy magazine. Back then, it was called the "Three Caballeros," and his co-stars were going to be Dan Aykroyd and John Belushi.